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  <title>返回路径中的目录部分</title>
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  <div id="layout-content"><div id="function.dirname" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">dirname</h1>
  <p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">dirname</span> &mdash; <span class="dc-title">返回路径中的目录部分</span></p>

 </div>
 
  <div class="refsect1 description" id="refsect1-function.dirname-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="methodname"><strong>dirname</strong></span>
    ( <span class="methodparam"><span class="type">string</span> <code class="parameter">$path</code></span>
   ) : <span class="type">string</span></div>

  <p class="para rdfs-comment">
   给出一个包含有指向一个文件的全路径的字符串，本函数返回去掉文件名后的目录名。
  </p>
 </div>

 
  <div class="refsect1 parameters" id="refsect1-function.dirname-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>

    
     <dt>
<code class="parameter">path</code></dt>

     <dd>

      <p class="para">
       一个路径。
      </p>
      <p class="para">
       在 Windows 中，斜线（<em>/</em>）和反斜线（<em>\</em>）都可以用作目录分隔符。在其它环境下是斜线（<em>/</em>）。
      </p>
     </dd>

    
   </dl>

  </p>
 </div>

 
  <div class="refsect1 returnvalues" id="refsect1-function.dirname-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   返回 path 的父目录。
   如果在 <code class="parameter">path</code>
    中没有斜线，则返回一个点（&#039;<em>.</em>&#039;），表示当前目录。否则返回的是把
    <code class="parameter">path</code> 中结尾的
    <em>/component</em>（最后一个斜线以及后面部分）去掉之后的字符串。
  </p>
 </div>

 
 <div class="refsect1 changelog" id="refsect1-function.dirname-changelog">
  <h3 class="title">更新日志</h3>
  <p class="para">
   <table class="doctable informaltable">
    
     <thead>
      <tr>
       <th>版本</th>
       <th>说明</th>
      </tr>

     </thead>

     <tbody class="tbody">
      <tr>
       <td>5.0.0</td>
       <td>
        <span class="function"><strong>dirname()</strong></span> 的操作从 PHP 5.0.0 版开始是二进制安全的。
       </td>
      </tr>

      <tr>
       <td>4.0.3</td>
       <td>
        在这个版本中，<span class="function"><strong>dirname()</strong></span> 被修正为
    POSIX 兼容。
       </td>
      </tr>

     </tbody>
    
   </table>

  </p>
 </div>


  <div class="refsect1 examples" id="refsect1-function.dirname-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="example-2766">
    <p><strong>Example #1 <span class="function"><strong>dirname()</strong></span> 例子</strong></p>
    <div class="example-contents">
<div class="phpcode"><pre><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br /></span><span style="color: #007700">echo&nbsp;</span><span style="color: #DD0000">"1)&nbsp;"&nbsp;</span><span style="color: #007700">.&nbsp;</span><span style="color: #0000BB">dirname</span><span style="color: #007700">(</span><span style="color: #DD0000">"/etc/passwd"</span><span style="color: #007700">)&nbsp;.&nbsp;</span><span style="color: #0000BB">PHP_EOL</span><span style="color: #007700">;&nbsp;</span><span style="color: #FF8000">//&nbsp;1)&nbsp;/etc<br /></span><span style="color: #007700">echo&nbsp;</span><span style="color: #DD0000">"2)&nbsp;"&nbsp;</span><span style="color: #007700">.&nbsp;</span><span style="color: #0000BB">dirname</span><span style="color: #007700">(</span><span style="color: #DD0000">"/etc/"</span><span style="color: #007700">)&nbsp;.&nbsp;</span><span style="color: #0000BB">PHP_EOL</span><span style="color: #007700">;&nbsp;</span><span style="color: #FF8000">//&nbsp;2)&nbsp;/&nbsp;(or&nbsp;\&nbsp;on&nbsp;Windows)<br /></span><span style="color: #007700">echo&nbsp;</span><span style="color: #DD0000">"3)&nbsp;"&nbsp;</span><span style="color: #007700">.&nbsp;</span><span style="color: #0000BB">dirname</span><span style="color: #007700">(</span><span style="color: #DD0000">"."</span><span style="color: #007700">);&nbsp;</span><span style="color: #FF8000">//&nbsp;3)&nbsp;.<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</pre></div>
    </div>

   </div>
  </p>
 </div>

 
  <div class="refsect1 notes" id="refsect1-function.dirname-notes">
  <h3 class="title">注释</h3>
  <blockquote class="note"><p><strong class="note">Note</strong>: 
   <p class="para">
    <span class="function"><strong>dirname()</strong></span> operates naively on the input string,
    and is not aware of the actual filesystem, or path components such
    as &quot;<em>..</em>&quot;.
   </p>
  </p></blockquote>
  <blockquote class="note"><p><strong class="note">Note</strong>: 
   <p class="para">
    <span class="function"><strong>dirname()</strong></span> is locale aware, so for it to see the 
    correct directory name with multibyte character paths, the matching locale must 
    be set using the <span class="function"><a href="setlocale.html" class="function">setlocale()</a></span> function.
   </p>
  </p></blockquote>
  <blockquote class="note"><p><strong class="note">Note</strong>: 
   <p class="para">
    Since PHP 4.3.0, you will often get a slash or a dot back from
    <span class="function"><strong>dirname()</strong></span> in situations where the older
    functionality would have given you the empty string.
   </p>
  </p></blockquote>
  <p class="para">
   检查下面发生变化的例子：
   <div class="informalexample">
    <div class="example-contents">
<div class="phpcode"><pre><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br /><br /></span><span style="color: #FF8000">//&nbsp;PHP&nbsp;4.3.0&nbsp;以前<br /></span><span style="color: #0000BB">dirname</span><span style="color: #007700">(</span><span style="color: #DD0000">'c:/'</span><span style="color: #007700">);&nbsp;</span><span style="color: #FF8000">//&nbsp;返回&nbsp;'.'<br /><br />//&nbsp;PHP&nbsp;4.3.0&nbsp;以后<br /></span><span style="color: #0000BB">dirname</span><span style="color: #007700">(</span><span style="color: #DD0000">'c:/x'</span><span style="color: #007700">);&nbsp;</span><span style="color: #FF8000">//&nbsp;返回&nbsp;'c:'<br /></span><span style="color: #0000BB">dirname</span><span style="color: #007700">(</span><span style="color: #DD0000">'c:/Temp/x'</span><span style="color: #007700">);&nbsp;</span><span style="color: #FF8000">//&nbsp;返回&nbsp;'c:/Temp'<br /></span><span style="color: #0000BB">dirname</span><span style="color: #007700">(</span><span style="color: #DD0000">'/x'</span><span style="color: #007700">);&nbsp;</span><span style="color: #FF8000">//&nbsp;返回&nbsp;'\'<br /><br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</pre></div>
    </div>

   </div>
  </p>
 </div>


 <div class="refsect1 seealso" id="refsect1-function.dirname-seealso">
  <h3 class="title">参见</h3>
  <p class="para">
   <ul class="simplelist">
    <li class="member"><span class="function"><a href="basename.html" class="function" rel="rdfs-seeAlso">basename()</a> - 返回路径中的文件名部分</span></li>
    <li class="member"><span class="function"><a href="pathinfo.html" class="function" rel="rdfs-seeAlso">pathinfo()</a> - 返回文件路径的信息</span></li>
    <li class="member"><span class="function"><a href="realpath.html" class="function" rel="rdfs-seeAlso">realpath()</a> - 返回规范化的绝对路径名</span></li>
   </ul>
  </p>
 </div>

 
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